Carriage-feeding device for saw-mills



(No Model.)

0. S. HUTGHINSON.

CARRIAGE FEEDING DEVIOE FOR SAW MILLS.

No. 286,201. Patented Oct. 9, 1883.

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Units Srarns Plarnsrr tries.

CARRIAGE-FEEDING DEVICE FOR SAW-Mime.

SPECIFICATION forming part of Letters Patent No. 286,201, dated October9, 1883.

T at whom it may concern.-

Be it known that I, OLIVER S. HUTCI-IINSON, a citizen of the UnitedStates, residing at New LenoX, in the county of Berkshire and State ofMassachusetts, have invented new and useful Improvements inCarriage-Feeding Devices for Saw-Mills, of which the followingis aspecification.

This invention relates to improvements in the carriagefeeding devices ofcircular sawmills, the object beingto reduce and simplify the number ofparts of such devices, whereby the carriage is moved in both directionsthrough the instrumentality of a single pulley, combined withpeculiarly-operating mechanism for governing the movements of saidpulley.

In the drawings, forming part of this speeifieation, Figure 1 is a planview of a Saw-mill embodying my improvements. Fig. 2 is a sideelevation, partly in section; and Figs. 3,

4, and 5 are detail views.

In the drawings, A indicates the frame of the husk. i i are thestring-pieces, and i are the head-blocks, of the carriage. t is therack. c is the main shaft. Bis the driving-pulley. o c are cone-pulleys.c and w are connectingbclts. a and it are feedshafts. 3/ and D arefeed-pulleys. z is an idler. 0 is ahand-lever.

00 and d are arms on lever 0. box for shaft a.

The carriage string-pieces t of this machine consist of wrought-ironcontinuous strips of double T shape in cross-section, instead of woodenpieces, as ordinarily made, whereby greater rigidity and durability ofthe carriage are obtained. Said string-pieces are united by the ironhead-blocks The usual rack, t, is secured to the lower edge of one ofpieces 'i, and a pinion on the end of shaft a engages with said rack.

The shaft a is suitably supp ortedin the husk, and has the pulley Dsecured to its inner end. Said pulley D is provided with a deep groove,as shown, and with a bearing-face on each side of said groove. The belte, running from the pulley h on the main shaft 0, revolves pulley D inone direction when caused so to do by the operator. A shaft, 91., islocated on said n is a movable husk, and has one end extending over saidpulley D, and having a bearing in a verticallymovable box, m, saidshaft'n having fixed Application filed April 17, 1883. (No model.)

thereon the pulley y Said pulley 2 has a rib, 4, projecting from itsface, and said, rib and the parts 3 of the face of said pulley each sideof rib 4 are adapted to bear jointly on the face of pulley D and in theupper part of the groove therein. such depth that the passage of belt 6around it when pulleys 3/ and D are in contact is not interfered with.Conepulleys '0 v are placed on shaft 0 and on shaft a, whereby diiferentdegrees of speed may be given to the latter. A hand-lever, 0, is pivotedbeneath pulleys y and D, and has thereon an arm, (1, bearing on its endthe idler z, adapted to be operated against belt 6 to tighten it. ASecond arm, 00, of curved form, passes through an aperture 2 (shown indotted lines in Fig. 5) through the box m, supporting the end of shafta, near which pulley g is fixed. Said box in is adapted to be movedupward, carrying the end of shaft 02 and pulley y with it, when lever'ois swung toward it, causing said box to ride on arm 00, and to-beallowed to drop when lever 0 is swung from it.

The operation of my improvements is as follows: WVhen thecarriage is tobe started to feed toward the saw, lever 0 is moved to the positionshown in Fig. 2, drawing arm :rthrough the aperture2 in box in, andletting the latter, the end of shaft a, and pulley y drop, andpermitting the periphery of said pulley to bear against pulley 'D,thereby rotating the latter and shaft (1. and moving the carriage, asabove stated. At the same time that pulley y is allowed to drop, asjust-stated, by said movement of lever 0, the idler z is, by the samemovement of said lever, lifted away from the belt 6, letting the latterrun Slack on pulley D, and offer no impediment. to the rotation of saidpulley in a contrary direction to the movement of said belt. \Vhen it isdesired to back off the carriage, lever 0 is swung toward box m, therebyraising pulley away from pulley D and forcing the idler 2 upon belt 6,and the latter then drives pulley D and shaft c in a contrary directionfrom that in which pulley 1 rotated it, thereby running the carriageback. Thus, bymeans of a single pulley, I), on shaft (0, capable ofbeing rotated in two directions by pulley y and belt 0, the carriage iseasily run in both directions, and the construction of the The groove inpulley D is of feed mechanism in mills of ,this class is muchsimplified.

NVhat I claim as my invention is- 1. In asaw-mill carriage-feedingdevice having suitable driving mechanism a grooved pulley on thedriving-shaft having a belt, 6, running in said groove, a pulley with arib on its face adapted to enter the groove above the belt, said pulleybeing mounted on a movable shaft, and shifting mechanism, substantiallysuch as described, all the above elements in combination, so that themovable pulley may be thrown into operation and thebelt loosened,

or the pulley thrown out and the belt tight ened by shifting the parts,substantially as set "forth.

2. In a saw-mill carriage, the grooved pulley on its shaft, the beltrunning in said groove and connecting with the saw-arbor, the ribbedpulley on its adjustable shaft, the rib adapted to engage the groove inthe first-mentioned pulley, the adj ust-able bearing operated by thehand-lever, and the belt-tightener, also operated by the hand-lever, allthe elements combined, arranged, and operating substantially 25 as shownand set forth;

OLIVER S. HUTCHINSON.

\Vitnesses:

R. F. HYDE, WM. H. CI-IAIIN.

